Well, the actual amount of smoke depends on your coals, shisha bowl, ect. But the ice will make it cooler. Cooler smoke doesnt dissiapte as quickly and generally looks larger because of how thick the clouds are. If you were to switch the bases with warm water mid session, the amount of smoke would be the same, the only thng that would change is that the smoke would dissipate faster and appear to be "light".

I would check your shisha and bowl, make sure it is packed right, and that you have a good amount of heat on it.